[pvr] bump add-ons

Include latest pvr-addons work in XBMC alpha nightlies
(last pvr update was 14 July)

This includes approx 8 commits including

pvr.wmc versions 3.97/3.98/3.99
pvr.vuplus to 1.9.14
pvr.vnsi to 1.9.12

makefile tidy up
installation permission tidy up on linux
README and VS project updates to facilitate easier debugging/development of pvr addons in XBMC solution